Waterproof covering and process of making same



Oct. 4, 1927. 1,644,652

L. KlRscHBRAUN WATERPROOF COVERING- AND PROCESS OF MAKING SAME Filed Mag/.28 1920 Patented oa. 4, 1927.

l 1,644,652 PATENT OFFICE.

LESTER KIRSCHBRAUN, 0F HICAGO, ILLINOIS.

WATERPROOF COVEBING AN D PROCESS 0F MAKING SAME.

Application led May 28, 1920. Serial .'No. 384,900.

Among the salient objects of this invention are to provide a roduct which while made of very thin cahper felt 1s nevertheless particularl characterized by its strength and sti ness; to provide a product which has a minimum amount of the expensive fibrous constituents, and a maxlmum amount of the relatively cheap grit and asphalt constituents; to produce a product 1n which the saturated felt is advantageously made by my novel process of forming Waterproof pa er such as set forth in my pending app cation, Serial No. 339,690, filed .Nov. 21, 1919, but which if desired can be made from ordinary felt; to produce aproduct which because of the very thin caliper felt, can be made from iibrous constituents other than rag stock, as for example, mixed apers; to provide a product formed of lies between which is embedded grit suc `as crushed gravel, quartz, bricks, tiles or the like cheap waste material or cork, sawdust, limestone shells or the like; to produce a product particularly adapted for roofing elements as strip shingles, or the like; to

provide a novel process for producing this product and in general toprovide an improved .product and process of making same as referred to. A

Fig. 1 is an edge view of plies in position to be united. Y

Fig. 2 shows the united plies with the surfacing on the upper surface.

The process may be carried out as fol lows: Waterproof felt 1 may be formed in accordance with the invention disclosed in my said earlier application, or dry felt may be made and then saturated in the usual way. The caliper of this felt may be about 15 points. This felt is then coated with asphalt 2 and 'a grit surface?, applied as in the usual way. This may be very cheap grit as color and appearance are of no importance. Two such sheets ofJ this finished grit surface roofing are brought together with their grit covered surfaces opposed. To one or both of the grit surfaces must be first applied a coating of hot asphalt or the emulsied matrix 4 referred to in said prior application. These are then run lbetween pressure rolls for the purpose of firmly unitlng the two sheets with their opposed grit covered surfaces together. This forms a unitary structure of a sandwich like character.

This structure may be then run beneath 'the final .coating and nal gran ar facing may be as high as to 8O caliper.

Instead of embedding grit or the like between the sheets, iron filings, short pieces of metal, wood or other `reinforcing materials may be used. If' desired, more than two plies may be united in this way and by using suicient number of plies, a built-up structure of tile or block like character can be made.

On account of this novel modev of uniti these plies with their grit surfaces oppos and their particles interlocked, there results a high degree of structural stability which has not been ossible to obtain in heretofore known felte roofing compositions. This construction lends itself especially to the formation of roofing elements having a surface other than fiat structure, usual to prepared roofing. For example, it is possible to prepare a semi-rigid tile sha ed element which will maintain a curve structure similar to that of clay tiles and which will retain its original form under the influence of the summer sun.

of being somewhat resllient, and especially adapted to withstand rough handling im. transportation without injury.

I claim as my invention:

1. A waterproofed covering comprisin a plurality of bitumen-saturated folted b rous plies, opposed surfaces thereof having an adhesivecoating and a granular surfacing, and being ad esively united by a bituminous coating rigidi granular surfacing materlal of the plies, a coating and agranular surfacing on an exposed surface of said sheet.

2. A waterproofed covering comprising a plurality of bltumen-saturated felted fibrous plies coated with an adhesive substance and a granular surfacing, the opposed surfaces of the plies being adhesively united by a bituminous coating, the anularsurfaci'ng acting as interlocked reinforcing particles between said plies. C

3. A process of making a wate roof covering having inherent structural sti ess combining the of a bituminous binder, two relatively thin bitumen saturated felted fibrous sheets havin embedded comminuted reinforcing par' tic es between the opposed faces of said plies.

4.* A process of making a waterproof covering consisting in forming a plurality of bituminous saturated felted fibrous plies adhesively applying comminuted reinforcing cles to one face of each pl uniting the ees of the plies to which usai comminuted particles are embedded by means of a bituminous binder and forcing theplies togatherl so that the angular projections of the comminuted particles of one ply will enter the interstices between the comminuted particles of the other, ply, thus producing a product having inherent structural stiffness.

5. A waterproof felted plied covering 4med formed of bitumen-saturated fibre, and nonbituminous reinforcing particles embedded in the opposed surfaces ofthe plies the whole having'inherent structural stiiness.

6. A water roof covering consistin of a plurality of brous plies impregnate with a waterfroofin substance, the opposed surfaces o the pies coated with an adhesive .coating and a granular surfacing aixed thereto, said plies united with an adhesive 111m.v

7. A waterproof covering' consistin of. a l

plurality of fibrous plies impregnate lwith a Water rooin substance, the opposed surfaces o the p ies coated with an adhesive coating having a granular surfacing) afixed c thereto, said -plies united with a itumen medium.

LESTER KIRS CHBRAUN 

